function login() {
    console.log("welcome to login page.");
    alert("welcome to login page.");
    window.location.href="login.html";
}

function Buy() {
    console.log("welcome to BUY CAR");
    alert("welcome to BUY CAR");
    window.location.href="main.html";
}

function myHelloFunction(){
    console.log("hello !Here, you can choose the car model you like");
    alert("hello !Here, you can choose the car model you like");
    window.location.href="main4.html";
}